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Need help with a school project...

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teebaum

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Well heres my problem, im new at electronics so i will start out like this. Im using a ninevolt battery to turn on two leds at the same time (easy). What i need is to syncronize the second led to turn on a fraction of a second later then the first one, but by turning on the same switch. Any ideas? Thanks...
 
I am a newbie too, so if my idea is wrong pls don't laugh.
Here goes...
 

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Hi teebaum can you tell a bit more about your circuit.After th switch is pressed the first LED lights up & the second LED turns ON after a while.Do you need to stay like that?or how are you going to switch OFF that?or you don't need to switch off?Are you using a push button or another switch?
 
Please provide more details on what you need.

What exactly are you tring to do? If you want an LED to turn ON and a second LED to turn ON a fraction of a second later I would use a microcontroller.

If you want an RC delay on the second LED? To make it look like it came on later, that is fine as well..

But if you do not know what a capacitor (CAP) is "and" you have it working "(easy)" with a 9VDC battery (you better know what a resistor is).

So please provide more details.
 
The circuit needs to have a resistor to limit the current in the LEDs.
 
teebaum said:
What is a cap? Im sorry i have no pics but what is posted above gives a good idea...

Google 'capacitor'. It's a component which can store charge. It takes a certain amount of time to charge, which could be useful to you.

A link which may also be helpful: https://www.answers.com/topic/rc-circuit


Torben
 
I know what a capacitor is, i just didnt notice the acronym. I have an okay understanding, but what size capacitor would you recomend for this short delay.
 
arunb said:
a micro-controller is not justified for a simple project like this, you could use 555 instead...

That sort of depends on what you have on your bench. If you have an ICD2 or AVR dragon and a $.50 US 8 pin microcontroller on the bench, it could be.

For a school project you are probably are correct.

The thought was if the person did not know what a cap (capacitor) was, that could be another option.
 
This application just begs for a PIC10xx or an ATTiny11.

But your professor probably will insist you use resistors and capacitors.
 
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